And, to put that into perspective ... I have seen exactly the same happening in T3 (they still have a few flights operating from there). BA 747 pulls onto stand, no BA staff anywhere to be seen. Nobody to apply ground power, nobody to apply chocks, no ground engineer with a headset to talk to the crew. I've also seen the aircraft waiting for about 15 minutes before the jetty starts to move.
I'm a 'ramp agent' myself, so I know what should happen; if I did something similar (or, not, as the case may be), my a&%e would be kicked from one end of the airport to the other.